Anatomical systems or organ system are systems of anatomically related structures.

Organs within a system may be related in any number of ways, but relationships of function are most commonly used. For example the urinary system comprises organs that work together to produce, store, and carry urine.

The anatomy of individual organisms can be seen to consist of a number of interrelated anatomical systems. These functioning of these systems may give rise to , or be affected, by psychological phenomena These include: